Develop Reference

GridView item height is mismatched with other

I am using a grid view. It shows issue in some devices. One item of the grid view looks shorter in height than others.
It looks like this in some devices, and in some its fine.
Layout :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:background="#android:color/white"
android:layout_height="match_parent">
</RelativeLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.admin.fueloneApp.MainDriver"
tools:showIn="#layout/app_bar_main"
android:weightSum="8">
<TextView
android:id="#+id/main_welcome"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="#dimen/dimen_20dp"
android:text="#string/welcome"
android:textColor="#color/colorPrimary"
android:textStyle="bold" />
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/gridviewMain"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="#dimen/dimen_40dp"
android:layout_marginLeft="#dimen/dimen_40dp"
android:layout_marginRight="#dimen/dimen_40dp"
android:columnWidth="80dp"
android:horizontalSpacing="#dimen/dimen_10dp"
android:numColumns="2"
android:stretchMode="columnWidth"
android:verticalSpacing="10dp"></GridView>
</LinearLayout>
</ScrollView>
<TextView
android:id="#+id/textView20"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_centerInParent="false"
android:text="For Any Queries Related To Mobile App Click On Service Request"
android:textAlignment="center" />
</RelativeLayout>
Item layout
EDIT : Added item layout of the grid view.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/single_grid"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimary1"
android:orientation="vertical">
<ImageView
android:id="#+id/gris_img"
android:layout_gravity="center"
android:layout_width="80dp"
android:scaleType="fitXY"
android:layout_height="100dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/grid_cat"
android:textSize="15sp"
android:textColor="#color/divider_color"
android:gravity="center"/>
</LinearLayout>
How can I manage the height of each item? What is the solution for this? Please help. thank you...

Gridview is having a tendency to adjust the height of all element with the tallest element in all. Hence this behaviour you are seeing.You can use StaggeredGridView.

i think your grid layout cell height is wrap_content. this problem same occur with me . change your layout height wrap_content to match_parent.
android:layout_height="match_parent"
for better solution please update your grid view item layout cell here.

Add Textview property :
android:maxLines="1"
android:singleLine="true"
if text not visible single line, you need change textview to autosizing-textview
enter link description here

How to change the height dynamically according to screen size?

I have a RelativeLayout with a ViewPager and another LinearLayout. I have set the layout width of the ViewPager as match_parent and have given the layout height a fixed value of 250dp.
However, when changing the screen sizes bigger and bigger, the height of the ViewPager gets smaller.
How to make the height change according to screen size?
If I set the height to wrap_content it almost takes up the whole screen except for a smaller bit reserved for the other layout.
The code is posted below.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.sloid.destinations.navigationdrawerfragments.aboutSLFragment">
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="250dp"
android:layout_marginBottom="8dp"/>
<LinearLayout
android:id="#+id/SliderDots"
android:layout_below="#+id/viewPager"
android:orientation="horizontal"
android:gravity="center_vertical|center_horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>

Try using this
If you want to make your screen design for multiple devices ,
You can use WeightSum with LinearLayout as Container to avoid this like below :-
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="10"
tools:context="com.example.sloid.destinations.navigationdrawerfragments.aboutSLFragment">
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3.5"
android:layout_marginBottom="8dp"/>
<LinearLayout
android:id="#+id/SliderDots"
android:layout_below="#+id/viewPager"
android:orientation="horizontal"
android:gravity="center_vertical|center_horizontal"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="6.5"
/>
</LinearLayout>
for reference :-https://developer.android.com/reference/android/widget/LinearLayout.html

You could also use modern new ConstraintLayout https://developer.android.com/training/constraint-layout/index.html
to set percentage of viewpager view relative to screen height (33% in example below)
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/SliderDots"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_weight="1" />
<LinearLayout
android:id="#+id/SliderDots"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_below="#+id/viewPager"
android:gravity="center_vertical|center_horizontal"
android:orientation="horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/viewPager"
app:layout_constraintVertical_weight="2" />
</android.support.constraint.ConstraintLayout>

To strictly answer your question :
How to make the height change according to screen size?
You can externalize your height value to the dimens.xml in the default values folder, like
<dimen name="view_pager_height">250dp</dimen>
and in the values-sw720dp folder you can put
<dimen name="view_pager_height">300dp</dimen>
Then use it in the layout like this:
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="#dimen/view_pager_height"
android:layout_marginBottom="8dp"/>
Read more about that here: Using new size qualifiers.
Besides that, you can use a LinearLayout as a parent, and set weights to each child. (RelativeLayouts as parents are quite expensive, as they double measure their children)

Set viewpager to be above sliderdots.
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.sloid.destinations.navigationdrawerfragments.aboutSLFragment">
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/SliderDots"/>
<LinearLayout android:id="#+id/SliderDots"
android:orientation="horizontal"
android:gravity="center_vertical|center_horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>

ImageView Not Working Without a SetValue

This may be a stupid question but actually I do not think it is.
I am getting pictures from Firebase and my problem is that I am facing problem to display it without setting a Number to width or Height. For instance, I cannot see the image in my phone by using these lines of codes
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
or with this one
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
However, if I set a real Number to layout_width or layout_height, I am able to see the picture. For instance,
android:layout_width="wrap_content"
android:layout_height="320dp"
android:adjustViewBounds="true"
Anyone can help me to solve it. Why using wrap_content or Match_parent is not working?
Edit: my Current Layout
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
app:cardCornerRadius="5dp"
app:cardElevation="2dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/gridViewImagee"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
/>
</LinearLayout>
By the way I am CoordinateLayout which has a Width and height of match_parent. My RecyclerView Item is located here:
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerViewSingleProf"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.NestedScrollView>

Android Studio - weightSum

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="10"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:layout_weight="2">
<TextView
android:id="#+id/centerText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="#FFFFFF"
android:textSize="28sp"
android:text="HALLO ALLE"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/centerText"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="10"
android:layout_weight="8"
android:orientation="horizontal">
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Btn 1"
android:layout_weight="2"/>
</LinearLayout>
Hi everybody, this is my code and I have a question about this I set a weightSum in the first LinearLayout I set the weightSum of 10, which the RelativeLayout has 2/10 and the other one (LinearLayout) has 8/10, as I saw in the preview of my IDE (Android Studio), the RelativeLayout is the bigger one here's my question:
The layout_weight with less value will be the bigger one?

No, the larger value for layout_weight should be the bigger one.
When using layout_weight you should set either the height or width to 0dp; in a vertical layout you're dealing with height and in a horizontal one it's width.
So in your case your root layout is a vertical LinearLayout. Within that, your relative layout with a weight of '2' should have android:layout_height="0dp" and the same for your LinearLayout with a weight of '8'.

From the documentation:
A larger weight value allows it to expand to fill any remaining space in the parent view
The key part here is "remaining space"
This means that if the RelativeLayout height is bigger them half of its parent height, it will be bigger then the LinearLayout no matter to what value you set its android:layout_weight property

I believe you are looking for something like this: (top takes up 20% bottom takes up 80%)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="5"
android:orientation="vertical">
<!-- Specify height as 0dp-->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#000000"
android:layout_weight="1">
<TextView
android:id="#+id/centerText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="#FFFFFF"
android:textSize="28sp"
android:text="HALLO ALLE"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/centerText"
android:text="Button top"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
<!-- Specify height as 0dp -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="4"
android:orientation="horizontal">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Btn 1"/>
</LinearLayout>
</LinearLayout>
When dealing with layout weights you supply 0dp to the layout width or height of the weighted item when parents orientation is horizontal or vertical.

When ever using weights it is better to use corresponding one to 0dp and then use the layout_weight....like
In Case of android:orientation="horizontal"
Use the following code
android:layout_width="match_parent"
android:layout_height="0dp"
In Case of android:orientation="vertical"
Use the following code
android:layout_width="0dp"
android:layout_height="match_parent"

set width and height as percentage in relative layout

I would like to have this: a ViewPager overlaid by 2 arrows
And I get what I want by this code. However, I got these warnings of lint :
this layout is useless (for dummy layouts)
nested weights are bad for performance.
I wonder if there is a better way to get this UI as I want.
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.view.ViewPager
android:id="#+id/dialog_instruction_pager"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</android.support.v4.view.ViewPager>
<!-- this LinearLayout overlays the ViewPager -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >
<!-- This is just the container for the left and right arrows , it is allocated with only 20% of screen height-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight=".2"
android:orientation="horizontal" >
<!-- I want to align this to the left and set width only 5% of the parent -->
<ImageButton
android:id="#+id/instruction_dialog_left_arrow"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".05"
android:background="?android:attr/selectableItemBackground"
android:scaleType="fitCenter"
android:src="#drawable/arrow_left_grey" />
<!-- This is the dummy layout, standing in the middle of 2 arrows so they can be align to the left and right of the parent -->
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".8" >
</LinearLayout>
<!-- I want to align this to the right and set width only 5% of the parent-->
<ImageButton
android:id="#+id/instruction_dialog_right_arrow"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".05"
android:background="?android:attr/selectableItemBackground"
android:scaleType="fitCenter"
android:src="#drawable/arrow_right_grey" />
</LinearLayout>
</LinearLayout>
P.S: Is there any layout that allows align children left, right, bottom (like RelativeLayout) and also allows set width, height as percentage (like "weight" attribute in LinearLayout)?
Thank you !

try this
to avoid this layout is useless (for dummy layouts) u should android:background="#android:color/transparent" and add dummy view in that linear layout because layout should not be empty.
to avoid nested weights are bad for performance add one child linear layout.
and read my comments in code
and added parent layout for imageview to make image vertically center
try this code
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/dialog_instruction_pager"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></android.support.v4.view.ViewPager>
<!-- this LinearLayout overlays the ViewPager -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<!-- This is just the container for the left and right arrows , it is allocated with only 20% of screen height-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight=".2"
android:orientation="horizontal">
<!--child layout to avoid nested weight with `waighSum` property-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="100">
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="5"
android:gravity="center_vertical"
android:orientation="horizontal">
<!-- I want to align this to the left and set width only 5% of the parent -->
<ImageButton
android:id="#+id/instruction_dialog_left_arrow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/selectableItemBackground"
android:scaleType="fitCenter"
android:src="#drawable/icon_clock" />
</LinearLayout>
<!-- This is the dummy layout, standing in the middle of 2 arrows so they can be align to the left and right of the parent -->
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="90"
android:background="#android:color/transparent">// this line also makes layout usefull
<!-- dummy view becouse layout should not be empty -->
<View
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="5"
android:gravity="center_vertical"
android:orientation="horizontal">
<!-- I want to align this to the right and set width only 5% of the parent-->
<ImageButton
android:id="#+id/instruction_dialog_right_arrow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/selectableItemBackground"
android:scaleType="fitCenter"
android:src="#drawable/icon_clock" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</FrameLayout>
hope it works for u

Google introduced new API called android.support.percent
1)PercentRelativeLayout
2)PercentFrameLayout
Add compile dependency like
compile 'com.android.support:percent:23.1.1'
You can specify dimension in percentage so get both benefit of RelativeLayout and percentage
<android.support.percent.PercentRelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<TextView
app:layout_widthPercent="40%"
app:layout_heightPercent="40%"
app:layout_marginTopPercent="15%"
app:layout_marginLeftPercent="15%"/>
</android.support.percent.PercentRelativeLayout/>

Try the below code and see whether it works,
This code will get the layout what you have attached
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.v4.view.ViewPager
android:id="#+id/dialog_instruction_pager"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/theme_blue" >
</android.support.v4.view.ViewPager>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:background="#drawable/ic_launcher" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerInParent="true"
android:background="#drawable/ic_launcher" />
</RelativeLayout>

Try using RelativeLayout and then set the left image to alignParentLeft and the right image to alignParentRight